939189661 has 4 divisors (see below), whose sum is σ = 942027424. Its totient is φ = 936351900.

The previous prime is 939189623. The next prime is 939189689. The reversal of 939189661 is 166981939.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 939189661 - 2⁹ = 939189149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 939189599 and 939189608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939189161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1418385 + ... + 1419046.

It is an arithmetic number, because the mean of its divisors is an integer number (235506856).

Almost surely, 2^939189661 is an apocalyptic number.

It is an amenable number.

939189661 is a deficient number, since it is larger than the sum of its proper divisors (2837763).

939189661 is a wasteful number, since it uses less digits than its factorization.

939189661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837762.

The product of its digits is 629856, while the sum is 52.

The square root of 939189661 is about 30646.2014122468. The cubic root of 939189661 is about 979.3045395532.

The spelling of 939189661 in words is "nine hundred thirty-nine million, one hundred eighty-nine thousand, six hundred sixty-one".